Antiferromagnetic order and spin glass behavior in Dy2CuIn3

► Dy2CuIn3 is characterized by the dominance of antiferromagnetic (AF) interactions. ► Geometric frustration and crystal field effects prevent the formation of the full magnetic moment on the Dy ions. ► Two magnetic regimes are recognized: an AF state and a mixed AF-glassy state. ► The antiferromagnetic structure of the compound has been determined.